I'm not sure what your finished arrow weight would be, that will have a big effect on what sort of speeds you'll get.

The Black Ice isn't lightning fast, but of course, it doesn't really have to be.

At 60#s with a perfect 300 gr arrow, at 28.5", a gent I shoot with has his going 285, which is pretty fast considering. With your set up, I would expect somewhere in the 260s, maybe low 270s. Depends all on that finished arrow weight